CLIPPERTON ISLAND DECAPODS—CHACE 621 
Ficure 1.—Petrolisthes haigae, new species, male holotype, showing color pattern in pre- 
served specimen: a, Carapace and chelipeds, & 5.4; b, right first walking leg, X 3.8; 
c, right third maxilliped, X 3.8; d, right antennule in ventral view, X 10.8. 
smaller one proximad to it on outer dorsal surface; a single, sharp 
spine on distal ventral margin. Carpus with row of prominent, 
seale-like rugae near dorsal midline; inner margin with four or five, 
rarely six, broad, denticulate teeth, the proximal two or three spine- 
tipped; outer margin with tooth-like rugae over entire length, and 
armed, in addition to terminal pair of spines, with none to five, usually 
three, sharp spines. Chelae densely pubescent, especially on outer 
part, with prominent ridge running proximad from gape of fingers 
and separating horizontal inner portion of hand from slanting outer 
